mv_localbus.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 Semihalf.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_platform.h"
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/ktr.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/bus.h>
   39 #include <sys/rman.h>
   40 #include <sys/malloc.h>
   41 #include <sys/devmap.h>
   42 
   43 #include <vm/vm.h>
   44 
   45 #include <machine/fdt.h>
   46 
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/ofw_bus_subr.h>
   49 #include <dev/ofw/openfirm.h>
   50 
   51 #include "dev/fdt/fdt_common.h"
   52 #include "ofw_bus_if.h"
   53 
   54 #include <arm/mv/mvvar.h>
   55 #include <arm/mv/mvwin.h>
   56 
   57 #ifdef DEBUG
   58 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
   59     printf(fmt,##args); } while (0)
   60 #else
   61 #define debugf(fmt, args...)
   62 #endif
   63 
   64 #define MV_LOCALBUS_MAX_BANKS           8
   65 #define MV_LOCALBUS_MAX_BANK_CELLS      4
   66 
   67 static MALLOC_DEFINE(M_LOCALBUS, "localbus", "localbus devices information");
   68 
   69 struct localbus_bank {
   70         vm_offset_t     va;             /* VA of the bank */
   71         vm_paddr_t      pa;             /* physical address of the bank */
   72         vm_size_t       size;           /* bank size */
   73         uint8_t         mapped;         /* device memory has mapping */
   74 };
   75 
   76 struct localbus_softc {
   77         device_t                sc_dev;
   78         bus_space_handle_t      sc_bsh;
   79         bus_space_tag_t         sc_bst;
   80         int                     sc_rid;
   81 
   82         struct localbus_bank    *sc_banks;
   83 };
   84 
   85 struct localbus_devinfo {
   86         struct ofw_bus_devinfo  di_ofw;
   87         struct resource_list    di_res;
   88         int                     di_bank;
   89 };
   90 
   91 struct localbus_va_entry {
   92         int8_t          bank;
   93         vm_offset_t     va;
   94         vm_size_t       size;
   95 };
   96 
   97 /*
   98  * Prototypes.
   99  */
  100 static int localbus_probe(device_t);
  101 static int localbus_attach(device_t);
  102 static int localbus_print_child(device_t, device_t);
  103 
  104 static struct resource *localbus_alloc_resource(device_t, device_t, int,
  105     int *, rman_res_t, rman_res_t, rman_res_t, u_int);
  106 static struct resource_list *localbus_get_resource_list(device_t, device_t);
  107 
  108 static ofw_bus_get_devinfo_t localbus_get_devinfo;
  109 
  110 /*
  111  * Bus interface definition.
  112  */
  113 static device_method_t localbus_methods[] = {
  114         /* Device interface */
  115         DEVMETHOD(device_probe,         localbus_probe),
  116         DEVMETHOD(device_attach,        localbus_attach),
  117         DEVMETHOD(device_detach,        bus_generic_detach),
  118         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  119         DEVMETHOD(device_suspend,       bus_generic_suspend),
  120         DEVMETHOD(device_resume,        bus_generic_resume),
  121 
  122         /* Bus interface */
  123         DEVMETHOD(bus_print_child,      localbus_print_child),
  124         DEVMETHOD(bus_alloc_resource,   localbus_alloc_resource),
  125         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  126         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  127         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  128         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  129         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  130         DEVMETHOD(bus_get_resource_list, localbus_get_resource_list),
  131 
  132         /* OFW bus interface */
  133         DEVMETHOD(ofw_bus_get_devinfo,  localbus_get_devinfo),
  134         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
  135         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
  136         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
  137         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
  138         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
  139         { 0, 0 }
  140 };
  141 
  142 static driver_t localbus_driver = {
  143         "localbus",
  144         localbus_methods,
  145         sizeof(struct localbus_softc)
  146 };
  147 
  148 const struct localbus_va_entry localbus_virtmap[] = {
  149         {  0, MV_DEV_BOOT_BASE,         MV_DEV_BOOT_SIZE },
  150         {  1, MV_DEV_CS0_BASE,          MV_DEV_CS0_SIZE },
  151         {  2, MV_DEV_CS1_BASE,          MV_DEV_CS1_SIZE },
  152         {  3, MV_DEV_CS2_BASE,          MV_DEV_CS2_SIZE },
  153         { -1, 0, 0 }
  154 };
  155 
  156 static struct localbus_bank localbus_banks[MV_LOCALBUS_MAX_BANKS];
  157 
  158 devclass_t localbus_devclass;
  159 
  160 DRIVER_MODULE(localbus, ofwbus, localbus_driver, localbus_devclass, 0, 0);
  161 
  162 static int
  163 fdt_localbus_reg_decode(phandle_t node, struct localbus_softc *sc,
  164     struct localbus_devinfo *di)
  165 {
  166         u_long start, end, count;
  167         pcell_t *reg, *regptr;
  168         pcell_t addr_cells, size_cells;
  169         int tuple_size, tuples;
  170         int i, rv, bank;
  171 
  172         if (fdt_addrsize_cells(OF_parent(node), &addr_cells, &size_cells) != 0)
  173                 return (ENXIO);
  174 
  175         tuple_size = sizeof(pcell_t) * (addr_cells + size_cells);
  176         tuples = OF_getprop_alloc_multi(node, "reg", tuple_size, (void **)&reg);
  177         debugf("addr_cells = %d, size_cells = %d\n", addr_cells, size_cells);
  178         debugf("tuples = %d, tuple size = %d\n", tuples, tuple_size);
  179         if (tuples <= 0)
  180                 /* No 'reg' property in this node. */
  181                 return (0);
  182 
  183         regptr = reg;
  184         for (i = 0; i < tuples; i++) {
  185                 bank = fdt_data_get((void *)regptr, 1);
  186 
  187                 if (bank >= MV_LOCALBUS_MAX_BANKS) {
  188                         device_printf(sc->sc_dev, "bank number [%d] out of "
  189                             "range\n", bank);
  190                         continue;
  191                 }
  192 
  193                 /*
  194                  * If device doesn't have virtual to physical mapping don't add
  195                  * resources
  196                  */
  197                 if (!(sc->sc_banks[bank].mapped)) {
  198                         device_printf(sc->sc_dev, "device [%d]: missing memory "
  199                             "mapping\n", bank);
  200                         continue;
  201                 }
  202 
  203                 di->di_bank = bank;
  204                 regptr += 1;
  205 
  206                 /* Get address/size. */
  207                 rv = fdt_data_to_res(regptr, addr_cells - 1, size_cells, &start,
  208                     &count);
  209                 if (rv != 0) {
  210                         resource_list_free(&di->di_res);
  211                         goto out;
  212                 }
  213 
  214                 /* Check if enough amount of memory is mapped */
  215                 if (sc->sc_banks[bank].size < count) {
  216                         device_printf(sc->sc_dev, "device [%d]: not enough "
  217                             "memory reserved\n", bank);
  218                         continue;
  219                 }
  220 
  221                 regptr += addr_cells - 1 + size_cells;
  222 
  223                 /* Calculate address range relative to VA base. */
  224                 start = sc->sc_banks[bank].va + start;
  225                 end = start + count - 1;
  226 
  227                 debugf("reg addr bank = %d, start = %lx, end = %lx, "
  228                     "count = %lx\n", bank, start, end, count);
  229 
  230                 /* Use bank (CS) cell as rid. */
  231                 resource_list_add(&di->di_res, SYS_RES_MEMORY, di->di_bank,
  232                     start, end, count);
  233         }
  234         rv = 0;
  235 out:
  236         OF_prop_free(reg);
  237         return (rv);
  238 }
  239 
  240 static int
  241 localbus_probe(device_t dev)
  242 {
  243 
  244         if (!ofw_bus_is_compatible_strict(dev, "mrvl,lbc"))
  245                 return (ENXIO);
  246 
  247         device_set_desc(dev, "Marvell device bus");
  248 
  249         return (BUS_PROBE_DEFAULT);
  250 }
  251 
  252 static int
  253 localbus_attach(device_t dev)
  254 {
  255         device_t dev_child;
  256         struct localbus_softc *sc;
  257         struct localbus_devinfo *di;
  258         phandle_t dt_node, dt_child;
  259 
  260         sc = device_get_softc(dev);
  261         sc->sc_dev = dev;
  262         sc->sc_banks = localbus_banks;
  263 
  264         /*
  265          * Walk localbus and add direct subordinates as our children.
  266          */
  267         dt_node = ofw_bus_get_node(dev);
  268         for (dt_child = OF_child(dt_node); dt_child != 0;
  269             dt_child = OF_peer(dt_child)) {
  270                 /* Check and process 'status' property. */
  271                 if (!(ofw_bus_node_status_okay(dt_child)))
  272                         continue;
  273 
  274                 if (!(mv_fdt_pm(dt_child)))
  275                         continue;
  276 
  277                 di = malloc(sizeof(*di), M_LOCALBUS, M_WAITOK | M_ZERO);
  278                 if (ofw_bus_gen_setup_devinfo(&di->di_ofw, dt_child) != 0) {
  279                         free(di, M_LOCALBUS);
  280                         device_printf(dev, "could not set up devinfo\n");
  281                         continue;
  282                 }
  283 
  284                 resource_list_init(&di->di_res);
  285                 if (fdt_localbus_reg_decode(dt_child, sc, di)) {
  286                         device_printf(dev, "could not process 'reg' "
  287                             "property\n");
  288                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  289                         free(di, M_LOCALBUS);
  290                         continue;
  291                 }
  292 
  293                 /* Add newbus device for this FDT node */
  294                 dev_child = device_add_child(dev, NULL, -1);
  295                 if (dev_child == NULL) {
  296                         device_printf(dev, "could not add child: %s\n",
  297                             di->di_ofw.obd_name);
  298                         resource_list_free(&di->di_res);
  299                         ofw_bus_gen_destroy_devinfo(&di->di_ofw);
  300                         free(di, M_LOCALBUS);
  301                         continue;
  302                 }
  303 #ifdef DEBUG
  304                 device_printf(dev, "added child: %s\n\n", di->di_ofw.obd_name);
  305 #endif
  306                 device_set_ivars(dev_child, di);
  307         }
  308 
  309         return (bus_generic_attach(dev));
  310 }
  311 
  312 static int
  313 localbus_print_child(device_t dev, device_t child)
  314 {
  315         struct localbus_devinfo *di;
  316         struct resource_list *rl;
  317         int rv;
  318 
  319         di = device_get_ivars(child);
  320         rl = &di->di_res;
  321 
  322         rv = 0;
  323         rv += bus_print_child_header(dev, child);
  324         rv += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx");
  325         rv += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
  326         rv += bus_print_child_footer(dev, child);
  327 
  328         return (rv);
  329 }
  330 
  331 static struct resource *
  332 localbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  333     rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  334 {
  335         struct localbus_devinfo *di;
  336         struct resource_list_entry *rle;
  337 
  338         /*
  339          * Request for the default allocation with a given rid: use resource
  340          * list stored in the local device info.
  341          */
  342         if (RMAN_IS_DEFAULT_RANGE(start, end)) {
  343                 if ((di = device_get_ivars(child)) == NULL)
  344                         return (NULL);
  345 
  346                 if (type == SYS_RES_IOPORT)
  347                         type = SYS_RES_MEMORY;
  348 
  349                 rid = &di->di_bank;
  350                 rle = resource_list_find(&di->di_res, type, *rid);
  351                 if (rle == NULL) {
  352                         device_printf(bus, "no default resources for "
  353                             "rid = %d, type = %d\n", *rid, type);
  354                         return (NULL);
  355                 }
  356                 start = rle->start;
  357                 end = rle->end;
  358                 count = rle->count;
  359         }
  360 
  361         return (bus_generic_alloc_resource(bus, child, type, rid, start, end,
  362             count, flags));
  363 }
  364 
  365 static struct resource_list *
  366 localbus_get_resource_list(device_t bus, device_t child)
  367 {
  368         struct localbus_devinfo *di;
  369 
  370         di = device_get_ivars(child);
  371         return (&di->di_res);
  372 }
  373 
  374 static const struct ofw_bus_devinfo *
  375 localbus_get_devinfo(device_t bus, device_t child)
  376 {
  377         struct localbus_devinfo *di;
  378 
  379         di = device_get_ivars(child);
  380         return (&di->di_ofw);
  381 }
  382 
  383 int
  384 fdt_localbus_devmap(phandle_t dt_node, struct devmap_entry *fdt_devmap,
  385     int banks_max_num, int *banks_added)
  386 {
  387         pcell_t ranges[MV_LOCALBUS_MAX_BANKS * MV_LOCALBUS_MAX_BANK_CELLS];
  388         pcell_t *rangesptr;
  389         uint32_t tuple_size, bank;
  390         vm_paddr_t offset;
  391         vm_size_t size;
  392         int dev_num, addr_cells, size_cells, par_addr_cells, va_index, i, j, k;
  393 
  394         if ((fdt_addrsize_cells(dt_node, &addr_cells, &size_cells)) != 0)
  395                 return (EINVAL);
  396 
  397         par_addr_cells = fdt_parent_addr_cells(dt_node);
  398         if (par_addr_cells > 2) {
  399                 /*
  400                  * Localbus devmap initialization error: unsupported parent
  401                  * #addr-cells
  402                  */
  403                 return (ERANGE);
  404         }
  405 
  406         tuple_size = (addr_cells + par_addr_cells + size_cells);
  407         if (tuple_size > MV_LOCALBUS_MAX_BANK_CELLS)
  408                 return (ERANGE);
  409 
  410         tuple_size *= sizeof(pcell_t);
  411 
  412         dev_num = OF_getprop(dt_node, "ranges", ranges, sizeof(ranges));
  413         if (dev_num <= 0)
  414                 return (EINVAL);
  415 
  416         /* Calculate number of devices attached to bus */
  417         dev_num = dev_num / tuple_size;
  418 
  419         /*
  420          * If number of ranges > max number of localbus devices,
  421          * additional entries will not be processed
  422          */
  423         dev_num = MIN(dev_num, banks_max_num);
  424 
  425         rangesptr = &ranges[0];
  426         j = 0;
  427 
  428         /* Process data from FDT */
  429         for (i = 0; i < dev_num; i++) {
  430                 /* First field is bank number */
  431                 bank = fdt_data_get((void *)rangesptr, 1);
  432                 rangesptr += 1;
  433 
  434                 if (bank > MV_LOCALBUS_MAX_BANKS) {
  435                         /* Bank out of range */
  436                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  437                             size_cells);
  438                         continue;
  439                 }
  440 
  441                 /* Find virtmap entry for this bank */
  442                 va_index = -1;
  443                 for (k = 0; localbus_virtmap[k].bank >= 0; k++) {
  444                         if (localbus_virtmap[k].bank == bank) {
  445                                 va_index = k;
  446                                 break;
  447                         }
  448                 }
  449 
  450                 /* Check if virtmap entry was found */
  451                 if (va_index == -1) {
  452                         rangesptr += ((addr_cells - 1) + par_addr_cells +
  453                             size_cells);
  454                         continue;
  455                 }
  456 
  457                 /* Remaining child's address fields are unused */
  458                 rangesptr += (addr_cells - 1);
  459 
  460                 /* Parent address offset */
  461                 offset = fdt_data_get((void *)rangesptr, par_addr_cells);
  462                 rangesptr += par_addr_cells;
  463 
  464                 /* Last field is size */
  465                 size = fdt_data_get((void *)rangesptr, size_cells);
  466                 rangesptr += size_cells;
  467 
  468                 if (size > localbus_virtmap[va_index].size) {
  469                         /* Not enough space reserved in virtual memory map */
  470                         continue;
  471                 }
  472 
  473                 fdt_devmap[j].pd_va = localbus_virtmap[va_index].va;
  474                 fdt_devmap[j].pd_pa = offset;
  475                 fdt_devmap[j].pd_size = size;
  476 
  477                 /* Copy data to structure used by localbus driver */
  478                 localbus_banks[bank].va = fdt_devmap[j].pd_va;
  479                 localbus_banks[bank].pa = fdt_devmap[j].pd_pa;
  480                 localbus_banks[bank].size = fdt_devmap[j].pd_size;
  481                 localbus_banks[bank].mapped = 1;
  482 
  483                 j++;
  484         }
  485 
  486         *banks_added = j;
  487         return (0);
  488 }
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FreeBSD/Linux Kernel Cross Reference sys/arm/mv/mv_localbus.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/mv_localbus.c
